There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

If eleven plus two equals one, what does nine plus five equal?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

What is Luis Suarez's (Soccer Player) favorite tea?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?